CVE-2026-64395
Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: require source read access for duplicate extents
FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to
vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB
access mask granted to the source handle. A handle opened with attribute
access can consequently be used to copy file contents into an
attacker-readable destination.
Require FILE_READ_DATA on the source handle before either VFS operation,
matching other ksmbd data-copy paths.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Linux | Linux | — | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2d2ab6983620c2d60ce7db72133984ca3873b929, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 67bdad9cf01b25030e3bf00bbce6c309319d6663, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db231af842868268839f9f9619c68cb27830d8be … |
| Linux | Linux | — | 6.1.178 ≤ 6.1.*, 6.6.145 ≤ 6.6.*, 6.12.96 ≤ 6.12.*, 6.18.39 ≤ 6.18.* … |
References (6)
- https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929
- https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663
- https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f
- https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be
- https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d
- https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8